Hi, i recently brought 3 fish they were firemouths (cichlids) ive had tank set up for just under a year and thought was time to get a couple more my tank consits of girafe x2 convicts x2 ice blues x2 one unkown and an electric yellow, since adding the firemouths the firemouths have been slowly dyin first one last week so i did partial water change then the second one toinght, i had added some java fern but since takin that out as it made my water green, could it have been the java fern?